US20060292947A1 - Polyester fiber scrim and method for making same - Google Patents
Polyester fiber scrim and method for making same Download PDFInfo
- Publication number
- US20060292947A1 US20060292947A1 US11/288,860 US28886005A US2006292947A1 US 20060292947 A1 US20060292947 A1 US 20060292947A1 US 28886005 A US28886005 A US 28886005A US 2006292947 A1 US2006292947 A1 US 2006292947A1
- Authority
- US
- United States
- Prior art keywords
- scrim
- polyester fibers
- mechanically
- layer
- denier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
- B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
- B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
- B01D39/163—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin sintered or bonded
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2003—Glass or glassy material
- B01D39/2017—Glass or glassy material the material being filamentary or fibrous
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/02—Types of fibres, filaments or particles, self-supporting or supported materials
- B01D2239/025—Types of fibres, filaments or particles, self-supporting or supported materials comprising nanofibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/065—More than one layer present in the filtering material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/08—Special characteristics of binders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/20—All layers being fibrous or filamentary
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/02—Composition of the impregnated, bonded or embedded layer
- B32B2260/021—Fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/04—Impregnation, embedding, or binder material
- B32B2260/048—Natural or synthetic rubber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0207—Elastomeric fibres
- B32B2262/0215—Thermoplastic elastomer fibers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0253—Polyolefin fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0276—Polyester fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/101—Glass fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2459/00—Nets, e.g. camouflage nets
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/10—Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
- Y10T442/102—Woven scrim
- Y10T442/172—Coated or impregnated
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/10—Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
- Y10T442/102—Woven scrim
- Y10T442/183—Synthetic polymeric fiber
Definitions
- the present invention relates to filters, filter constructions, materials for use in filter constructions and methods of filtering.
- the present invention in particular relates to construction materials utilized for supporting one or more layers of fine fibers in filter media.
- Air filtration media used in application such as High Efficiency Particulate Air (HEPA) or Ultra Low Particulate Air (ULPA) filters require the use of very fine diameter fibers.
- These fibers can be formed from synthetic polymers, such as polyethylene, polypropylene and polyester or from glass microfibers.
- Webs or layers of these very fine diameter fibers are extremely fragile and must have some means of support when pleated and placed in the frame or cylindrical structure of the filter.
- wire screen and plastic netting are used as media supports. These supports may be acceptable for glass microfiber webs, which contain very low percentages of synthetic latex binders providing limited strength for processing.
- Melt blown and nanofiber webs and layers are pure polymers, which must be blown directly on to a blanket or carrier web. Synthetic scrims are used as these blankets.
- the use of a scrim having low porosity results in increased airflow resistance of the filter media, which is undesirable. Higher porosity can be achieved by reducing the basis weight of the scrim, but then its ability to be self-supporting is correspondingly diminished.
- a scrim which is designed for applications such as filters, may have the following desirable characteristics: (a) a sufficient basis weight to be self-supporting when pleated; (b) the ability to hold the shape of the pleats; and, (c) very high porosity (i.e., minimal, if any contribution to air flow resistance).
- a self-supporting scrim or web structure is provided for use in filter applications.
- the self-supporting scrim has very high porosity.
- the scrim or web structure retains the shape of pleats and contributes minimally to airflow resistance.
- An inventive wet-laid process with wet-web saturation is used for making the scrim or web structure.
- the wet-laid process parameters are controlled so that the wet-laid web has greater uniformity than webs formed by other processes, for example, spun bond webs or dry-laid webs. Control of blending of fibers of different thickness can be both costly and difficult in spun bond processes.
- the inventive wet-laid process allows blending of fibers of different thickness and lengths.
- Synthetic fibers of one or more polymer types and a latex binder (e.g. a thermoplastic binder) of a different polymer type may be used in the make the scrim or web structure.
- the scrim or web structure is thermally softened so that it can be shaped (e.g. pleated, corrugated) as desired for filter applications.
- the synthetic fibers and the latex or thermoplastic binding polymers in the scrim or web structure are selected to have different softening or melting points.
- the latex or thermoplastic binder is selected to soften or melt at relatively low temperatures so that the scrim or web structure can be shaped without damaging its fiber structure or losing its physical properties.
- inventive scrims and web structures are readily thermopleated in comparison to conventional nylon fiber based scrims.
- the polyester fibers and acrylic polymer latexes are much less expensive than nylon fibers.
- inventive wet-laid scrims or web structures can have considerably higher porosity that conventional nylon continuous filament webs. Additionally, the wet-laid scrims or web structures have higher permeability at equal basis weight than conventional spun bonded polyester scrims.
- Scrims are provided for filter applications.
- the scrims are self-supporting when pleated or corrugated.
- the scrims are fabricated suitable material compositions, which allow the scrim to hold the shape of the pleats and retain high porosity characteristics.
- wet-laid processes for web forming such scrims with the suitable material compositions are provided. These wet-laid processes of web forming provide greater uniformity than spun-bond webs and dry-laid webs.
- the wet-laid processes for scrim fabrication are more economical than conventional fabrication processes at least in part due to enhanced production speeds at which scrims can be formed by a wet-laid process.
- the inventive wet-laid process allows fabrication of scrims composed of blends of fibers of different thicknesses and lengths, which are costly and difficult to control in conventional processes such as spun bond processes.
- the wet-laid process with wet-web saturation allows the use of synthetic fibers of one or more polymer type and a latex binder of a different polymer type.
- the softening or melting points of the fibers and polymer types are selected to be different.
- the latex binder is a thermoplastic binder that can be softened without damaging the fiber structure. Webs fabricated using such latex binders can be shaped (e.g., pleated or corrugated) while maintaining or retaining their desirable physical properties.
- High porosity is very important in fabrics used as scrims, supports or carrier webs.
- inventive scrims may advantageously have considerably higher porosity that prior art fabrics or scrims. (See e.g., nylon continuous filament webs available from Cerex).
- the inventive scrims may have permeability values, which are significantly higher than those of conventional spun bonded polyester scrims of equal basis weight (e.g. such as scrims available from Reemay).
- the materials used for fabrication of the scrims can be substantially less expensive than nylon fibers, whose use in scrims has been previously suggested.
- Nylon fibers are an “overkill” for most scrim applications (except, for example, for very high temperature applications). Further, nylon fibers are not readily thermo-pleated.
- a web was formed on a Deltaformer® (Sandy Hill Corporation) and wet-web saturated with Rhoplex® GL-618 Acrylic Latex (Rohm and Haas Company) to a binder level of 25% of the total weight of the scrim and the web dried using conventional gas-fired ovens.
- the basis weight of the dried scrim was 2.4 oz/yd 2 (81 g/m 2 ).
- Scrims having basis weights of 2.0 oz/yd 2 (68 g/m 2 ), 1.8 oz/yd 2 (61 g/m 2 ) and 1.6 oz/yd 2 (54 g/m 2 ) were prepared in Examples II, III, and IV, respectively.
- the method of preparation used in each instance was similar to that used in Example I described above.
- This invention provides a wet-laid, high porosity, thermopleatable synthetic scrim, composed of polyester fibers and a thermoplastic synthetic latex binder.
- polyester fibers may constitute 65% to 85% of the weight of the scrim.
- the polyester fibers may have a thickness range of 6 denier (equivalent to 25 microns) to 15 denier (equivalent to 39 microns) and a cut length range of 0.5 inch to 1.5 inches.
- the synthetic latex binder material which may constitute 15% to 35% of the weight of the scrim, may be a thermoplastic acrylic resin.
- a suitable acrylic resin has a softening point between 200° F. and 300° F.
- the basis weight of the exemplary scrims may be in the range of 1.4 oz/yd 2 (47 g/m 2 ) to 2.6 oz/yd 2 (88 g/m 2 ) and have a Frazier porosity in the range of 700 to 1050 cfm/ft 2 .
- a particular scrim made from a polyester fiber and acrylic resin binder has a tensile strength of about 62 lbs/3′′ width, an elongation of about 10%, and Elmendorf tear value of about 972 grams.
- the inventive scrims are suitable for use in filtering structures.
- a dual layer filtration media formed by the application of melt-blown polypropylene fibers to one surface of the inventive scrim.
- combining an additional scrim layer with the dual layer media may form a triple layer filtration media.
- the additional scrim layer may be of any type including convention scrim types.
- a dual layer filtration media may be formed by combining a glass microfiber mat with a scrim of the present invention.
- a further layer of any type of scrim may be disposed on the open face of glass microfiber layer to form a three layer filtration media.
- a dual layer filtration media is formed by the application of polypropylene nanofibers to one surface of a scrim of the present invention.
- a further layer of any type of scrim may be disposed on the open face of polypropylene nanofiber layer to form a three layer filtration media.
- the dual and triple-layer self-supporting scrims may be mechanically and thermally pleated in suitable geometrical configurations for use as filter elements.
- a dual layer media is first mechanically pleated to form a pleated filtration media element. The pleat tips are then pushed or moved through a channel formed by top and bottom platens, which are heated to about 250° F. to 300° F. This heating softens the synthetic binder in the mechanically pleated scrim, which then retains the geometry of the pleats upon cooling.
- a three layer media including the inventive scrim layer is first mechanically pleated and then its pleat tips are pushed through a channel of top and bottom heated platens. Again heating the platens to about 250° F. to about 300° F. can soften the synthetic binder of the scrim, which then retains the geometry of the pleats upon cooling.
- the self-supporting scrims used in the two layer and three layer media elements may include a blend of polyester fibers of different thicknesses and cut lengths.
- the polyester fibers are a blend of 6 denier 1 ⁇ 2′′ and 15 denier 11 ⁇ 2′′ polyester fibers.
- the amounts of 6 denier to 15 denier polyester fibers may be selected to have a ratio of about 4:1 to about 19:1. In a preferred selection, the ratio may be from about 6:1 to about 12:1. A ratio of 9:1 of 6 denier to 15 denier polyester fibers may be most suitable.
- the self-supporting scrims fabricated from synthetic latex binder using the inventive wet-laid processes may have basis weight in the range of 1.4 oz/yd 2 (47 g/m 2 ) to 2.6 oz/yd 2 (88 g/m 2 ), or preferably in the range of 1.6 oz/yd 2 (54 g/m 2 ) to 2.4 oz/yd 2 (81 g/m 2 ).
- the synthetic latex binder used in the inventive scrim compositions may, for example, be a thermoplastic acrylic resin with a softening point between 200° F. and 300° F.
- the latex binder may constitute 15% to 35% of the weight of the scrim. Preferably 20% to 30% of the weight of the scrim, and most preferably 25% of the weight of the scrim.
- the inventive scrim may be characterized as having Frazier porosity in the range of 700 to 1050 cfm/ft 2 or preferably in the range of 750 to 970 cfm/ft 2 .
- the inventive wet laid scrim or web structure may be utilized in filter constructions in any suitable configuration or combination with other filter materials or components (e.g., melt blown polypropylene fibers, glass microfiber mat and polypropylene nanofibers).
- the Scrim may, for example, be configured as a layer in a dual or multiple layer filter media.
- a dual layer filtration media is formed by the application of melt blown polypropylene fibers to one surface of the Scrim. Further, a three-layer filtration media is formed by sandwiching a layer of melt blown polypropylene fibers between the Scrim and another scrim. The latter scrim may be of any type.
- a dual layer filtration media is formed by combining a glass microfiber mat with the Scrim. Further, a three layer filtration media is formed by sandwiching a layer of a glass microfiber mat between the Scrim and another scrim that may be of any type.
- similar dual or three-layer filtration media are obtained by replacing the glass microfiber mat or melt blown polypropylene layer by polypropylene nanofibers.
- the dual or multilayer media having the self-supporting Scrim may be mechanically shaped or pleated in the shape of the desired filter element. Portions of the mechanically shaped scrim then may be heated and cooled to form a self-supporting structure that preserves or retains the shape of the desired filter element.
- the pleated media is pushed through a channel composed of two platens. One or both platens are heated to 250° F. to 300° F. to soften the thermoplastic latex binder of the Scrim at the pleat tips. Upon exiting the channel and cooling, the pleats retain their shape.
Abstract
Description
- The present application claims priority from U.S. Provisional Patent Application No. 60/693,659 filed Jun. 24, 2005, the disclosure of which is incorporated herein by reference in its entirety.
- The present invention relates to filters, filter constructions, materials for use in filter constructions and methods of filtering. The present invention in particular relates to construction materials utilized for supporting one or more layers of fine fibers in filter media.
- Air filtration media used in application such as High Efficiency Particulate Air (HEPA) or Ultra Low Particulate Air (ULPA) filters require the use of very fine diameter fibers. These fibers can be formed from synthetic polymers, such as polyethylene, polypropylene and polyester or from glass microfibers.
- Webs or layers of these very fine diameter fibers are extremely fragile and must have some means of support when pleated and placed in the frame or cylindrical structure of the filter. Traditionally, wire screen and plastic netting are used as media supports. These supports may be acceptable for glass microfiber webs, which contain very low percentages of synthetic latex binders providing limited strength for processing.
- Melt blown and nanofiber webs and layers are pure polymers, which must be blown directly on to a blanket or carrier web. Synthetic scrims are used as these blankets. The use of a scrim having low porosity results in increased airflow resistance of the filter media, which is undesirable. Higher porosity can be achieved by reducing the basis weight of the scrim, but then its ability to be self-supporting is correspondingly diminished.
- Consideration is now being given improving the structural characteristics and other properties of scrims, and to methods for making such scrims. A scrim, which is designed for applications such as filters, may have the following desirable characteristics: (a) a sufficient basis weight to be self-supporting when pleated; (b) the ability to hold the shape of the pleats; and, (c) very high porosity (i.e., minimal, if any contribution to air flow resistance).
- A self-supporting scrim or web structure is provided for use in filter applications. The self-supporting scrim has very high porosity. When pleated and deployed for filter applications, the scrim or web structure retains the shape of pleats and contributes minimally to airflow resistance.
- An inventive wet-laid process with wet-web saturation is used for making the scrim or web structure. The wet-laid process parameters are controlled so that the wet-laid web has greater uniformity than webs formed by other processes, for example, spun bond webs or dry-laid webs. Control of blending of fibers of different thickness can be both costly and difficult in spun bond processes. In contrast, the inventive wet-laid process allows blending of fibers of different thickness and lengths.
- Synthetic fibers of one or more polymer types and a latex binder (e.g. a thermoplastic binder) of a different polymer type may be used in the make the scrim or web structure. The scrim or web structure is thermally softened so that it can be shaped (e.g. pleated, corrugated) as desired for filter applications. The synthetic fibers and the latex or thermoplastic binding polymers in the scrim or web structure are selected to have different softening or melting points. The latex or thermoplastic binder is selected to soften or melt at relatively low temperatures so that the scrim or web structure can be shaped without damaging its fiber structure or losing its physical properties.
- The inventive scrims and web structures are readily thermopleated in comparison to conventional nylon fiber based scrims. The polyester fibers and acrylic polymer latexes are much less expensive than nylon fibers. Further, the inventive wet-laid scrims or web structures can have considerably higher porosity that conventional nylon continuous filament webs. Additionally, the wet-laid scrims or web structures have higher permeability at equal basis weight than conventional spun bonded polyester scrims.
- Scrims are provided for filter applications. The scrims are self-supporting when pleated or corrugated. The scrims are fabricated suitable material compositions, which allow the scrim to hold the shape of the pleats and retain high porosity characteristics. Further, wet-laid processes for web forming such scrims with the suitable material compositions are provided. These wet-laid processes of web forming provide greater uniformity than spun-bond webs and dry-laid webs. Advantageously, the wet-laid processes for scrim fabrication are more economical than conventional fabrication processes at least in part due to enhanced production speeds at which scrims can be formed by a wet-laid process.
- The inventive wet-laid process allows fabrication of scrims composed of blends of fibers of different thicknesses and lengths, which are costly and difficult to control in conventional processes such as spun bond processes.
- The wet-laid process with wet-web saturation allows the use of synthetic fibers of one or more polymer type and a latex binder of a different polymer type. In most instances, the softening or melting points of the fibers and polymer types are selected to be different. In preferable compositions, the latex binder is a thermoplastic binder that can be softened without damaging the fiber structure. Webs fabricated using such latex binders can be shaped (e.g., pleated or corrugated) while maintaining or retaining their desirable physical properties.
- Such shaping properties are particularly remarkable when compared to spun bond polypropylene webs, since the entire structure softens and melts at relatively low temperatures.
- High porosity is very important in fabrics used as scrims, supports or carrier webs. The inventive scrims may advantageously have considerably higher porosity that prior art fabrics or scrims. (See e.g., nylon continuous filament webs available from Cerex).
- The inventive scrims may have permeability values, which are significantly higher than those of conventional spun bonded polyester scrims of equal basis weight (e.g. such as scrims available from Reemay).
- The materials used for fabrication of the scrims (e.g. polyester fibers and acrylic polymer latexes) can be substantially less expensive than nylon fibers, whose use in scrims has been previously suggested. Nylon fibers are an “overkill” for most scrim applications (except, for example, for very high temperature applications). Further, nylon fibers are not readily thermo-pleated.
- The methods and compositions of the present invention may be better understood or appreciated through the working Examples detailed below. These Examples are presented for purposes of illustration and should not be construed as limiting the invention in any way.
- A fiber furnish composed of 90% 6 denier ½″ length Type 103 polyester fiber and 10% 15 denier 1½″ Type 103 polyester fiber, both supplied by KoSa, were dispersed in a pulper, along with minor amounts of dispersant and viscosity modifier, commonly used in wet-laid mat manufacturing.
- A web was formed on a Deltaformer® (Sandy Hill Corporation) and wet-web saturated with Rhoplex® GL-618 Acrylic Latex (Rohm and Haas Company) to a binder level of 25% of the total weight of the scrim and the web dried using conventional gas-fired ovens. The basis weight of the dried scrim was 2.4 oz/yd2 (81 g/m2).
- Scrims having basis weights of 2.0 oz/yd2 (68 g/m2), 1.8 oz/yd2 (61 g/m2) and 1.6 oz/yd2 (54 g/m2) were prepared in Examples II, III, and IV, respectively. The method of preparation used in each instance was similar to that used in Example I described above.
- Properties of the samples of the scrims prepared in Examples I-IV were characterized using standardized physical tests. Table I shows several of the measured properties (i.e., basis weight, thickness, and Frazier porosity of these samples. Table I also references the corresponding standard test methods that were used to measure the individual properties.
TABLE I PHYSICAL PROPERTIES OF EXAMPLE I-IV SCRIMS Property Reference Ex. I Ex. II Ex. III Ex. IV Basis Weight Tappi T-410 2.4 2.0 1.8 1.6 (oz/yd2) Thickness (mil) Tappi T-411 26 24 22 21 Frazier Porosity ASTM D-737 750 863 901 970 (cfm/ft2) - It will be understood that the foregoing examples are only illustrative of the principles of the invention, and that various modifications can be made by those skilled in the art without departing from the scope and spirit of the invention. This invention provides a wet-laid, high porosity, thermopleatable synthetic scrim, composed of polyester fibers and a thermoplastic synthetic latex binder.
- In exemplary scrims, polyester fibers may constitute 65% to 85% of the weight of the scrim. The polyester fibers may have a thickness range of 6 denier (equivalent to 25 microns) to 15 denier (equivalent to 39 microns) and a cut length range of 0.5 inch to 1.5 inches. The synthetic latex binder material, which may constitute 15% to 35% of the weight of the scrim, may be a thermoplastic acrylic resin. A suitable acrylic resin has a softening point between 200° F. and 300° F.
- The basis weight of the exemplary scrims may be in the range of 1.4 oz/yd2 (47 g/m2) to 2.6 oz/yd2 (88 g/m2) and have a Frazier porosity in the range of 700 to 1050 cfm/ft2.
- A particular scrim made from a polyester fiber and acrylic resin binder has a tensile strength of about 62 lbs/3″ width, an elongation of about 10%, and Elmendorf tear value of about 972 grams.
- The inventive scrims are suitable for use in filtering structures. In one such structure, a dual layer filtration media formed by the application of melt-blown polypropylene fibers to one surface of the inventive scrim. Further, combining an additional scrim layer with the dual layer media may form a triple layer filtration media. The additional scrim layer may be of any type including convention scrim types. Alternatively, a dual layer filtration media may be formed by combining a glass microfiber mat with a scrim of the present invention. A further layer of any type of scrim may be disposed on the open face of glass microfiber layer to form a three layer filtration media.
- In another application, a dual layer filtration media is formed by the application of polypropylene nanofibers to one surface of a scrim of the present invention. A further layer of any type of scrim may be disposed on the open face of polypropylene nanofiber layer to form a three layer filtration media.
- The dual and triple-layer self-supporting scrims may be mechanically and thermally pleated in suitable geometrical configurations for use as filter elements. In one example, a dual layer media is first mechanically pleated to form a pleated filtration media element. The pleat tips are then pushed or moved through a channel formed by top and bottom platens, which are heated to about 250° F. to 300° F. This heating softens the synthetic binder in the mechanically pleated scrim, which then retains the geometry of the pleats upon cooling. In another example, a three layer media including the inventive scrim layer is first mechanically pleated and then its pleat tips are pushed through a channel of top and bottom heated platens. Again heating the platens to about 250° F. to about 300° F. can soften the synthetic binder of the scrim, which then retains the geometry of the pleats upon cooling.
- The self-supporting scrims used in the two layer and three layer media elements may include a blend of polyester fibers of different thicknesses and cut lengths. In one exemplary scrim, the polyester fibers are a blend of 6 denier ½″ and 15 denier 1½″ polyester fibers. In a particular scrim fabrications, the amounts of 6 denier to 15 denier polyester fibers may be selected to have a ratio of about 4:1 to about 19:1. In a preferred selection, the ratio may be from about 6:1 to about 12:1. A ratio of 9:1 of 6 denier to 15 denier polyester fibers may be most suitable.
- The self-supporting scrims fabricated from synthetic latex binder using the inventive wet-laid processes may have basis weight in the range of 1.4 oz/yd2 (47 g/m2) to 2.6 oz/yd2 (88 g/m2), or preferably in the range of 1.6 oz/yd2 (54 g/m2) to 2.4 oz/yd2 (81 g/m2).
- The synthetic latex binder used in the inventive scrim compositions may, for example, be a thermoplastic acrylic resin with a softening point between 200° F. and 300° F. The latex binder may constitute 15% to 35% of the weight of the scrim. Preferably 20% to 30% of the weight of the scrim, and most preferably 25% of the weight of the scrim.
- The inventive scrim may be characterized as having Frazier porosity in the range of 700 to 1050 cfm/ft2 or preferably in the range of 750 to 970 cfm/ft2.
- The inventive wet laid scrim or web structure (hereinafter “Scrim”) may be utilized in filter constructions in any suitable configuration or combination with other filter materials or components (e.g., melt blown polypropylene fibers, glass microfiber mat and polypropylene nanofibers). The Scrim may, for example, be configured as a layer in a dual or multiple layer filter media.
- In one exemplary filter construction, a dual layer filtration media is formed by the application of melt blown polypropylene fibers to one surface of the Scrim. Further, a three-layer filtration media is formed by sandwiching a layer of melt blown polypropylene fibers between the Scrim and another scrim. The latter scrim may be of any type. Similarly, in another exemplary filter construction, a dual layer filtration media is formed by combining a glass microfiber mat with the Scrim. Further, a three layer filtration media is formed by sandwiching a layer of a glass microfiber mat between the Scrim and another scrim that may be of any type. In yet another exemplary filter construction, similar dual or three-layer filtration media are obtained by replacing the glass microfiber mat or melt blown polypropylene layer by polypropylene nanofibers.
- The dual or multilayer media having the self-supporting Scrim may be mechanically shaped or pleated in the shape of the desired filter element. Portions of the mechanically shaped scrim then may be heated and cooled to form a self-supporting structure that preserves or retains the shape of the desired filter element. In an exemplary implementation of a “pleat retention” process, the pleated media is pushed through a channel composed of two platens. One or both platens are heated to 250° F. to 300° F. to soften the thermoplastic latex binder of the Scrim at the pleat tips. Upon exiting the channel and cooling, the pleats retain their shape.
- It will be understood that the foregoing is only illustrative of the principles of the invention and that various modifications can be made by those skilled in the art without departing from the scope and spirit of the invention, which is limited only by the claims that follow.
Claims (20)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/288,860 US20060292947A1 (en) | 2005-06-24 | 2005-11-29 | Polyester fiber scrim and method for making same |
CA2550466A CA2550466C (en) | 2005-06-24 | 2006-06-20 | Polyester fiber scrim and method for making same |
MXPA06007263A MXPA06007263A (en) | 2005-06-24 | 2006-06-23 | Polyester fiber scrim and method for making same. |
US11/541,329 US20070023958A1 (en) | 2005-06-24 | 2006-09-29 | Polyester fiber scrim and method for making same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US69365905P | 2005-06-24 | 2005-06-24 | |
US11/288,860 US20060292947A1 (en) | 2005-06-24 | 2005-11-29 | Polyester fiber scrim and method for making same |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/541,329 Division US20070023958A1 (en) | 2005-06-24 | 2006-09-29 | Polyester fiber scrim and method for making same |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060292947A1 true US20060292947A1 (en) | 2006-12-28 |
Family
ID=37561694
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/288,860 Abandoned US20060292947A1 (en) | 2005-06-24 | 2005-11-29 | Polyester fiber scrim and method for making same |
US11/541,329 Abandoned US20070023958A1 (en) | 2005-06-24 | 2006-09-29 | Polyester fiber scrim and method for making same |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/541,329 Abandoned US20070023958A1 (en) | 2005-06-24 | 2006-09-29 | Polyester fiber scrim and method for making same |
Country Status (3)
Country | Link |
---|---|
US (2) | US20060292947A1 (en) |
CA (1) | CA2550466C (en) |
MX (1) | MXPA06007263A (en) |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8419934B1 (en) * | 2008-10-30 | 2013-04-16 | Sundance Spas, Inc. | Filter |
US8608817B2 (en) | 2007-11-09 | 2013-12-17 | Hollingsworth & Vose Company | Meltblown filter medium |
US8679218B2 (en) | 2010-04-27 | 2014-03-25 | Hollingsworth & Vose Company | Filter media with a multi-layer structure |
US8950587B2 (en) | 2009-04-03 | 2015-02-10 | Hollingsworth & Vose Company | Filter media suitable for hydraulic applications |
US8986432B2 (en) | 2007-11-09 | 2015-03-24 | Hollingsworth & Vose Company | Meltblown filter medium, related applications and uses |
US20160082376A1 (en) * | 2014-09-19 | 2016-03-24 | Kyung-Ju Choi | Filter material comprising an expanded polytetrafluoroethylene containing layer and a natural fiber containing layer |
US9474994B2 (en) | 2013-06-17 | 2016-10-25 | Donaldson Company, Inc. | Filter media and elements |
US9694306B2 (en) | 2013-05-24 | 2017-07-04 | Hollingsworth & Vose Company | Filter media including polymer compositions and blends |
US20180236384A1 (en) * | 2017-02-21 | 2018-08-23 | Hollingsworth & Vose Company | Electret-containing filter media |
US10155186B2 (en) | 2010-12-17 | 2018-12-18 | Hollingsworth & Vose Company | Fine fiber filter media and processes |
US10252200B2 (en) | 2016-02-17 | 2019-04-09 | Hollingsworth & Vose Company | Filter media including a filtration layer comprising synthetic fibers |
US10343095B2 (en) | 2014-12-19 | 2019-07-09 | Hollingsworth & Vose Company | Filter media comprising a pre-filter layer |
US10357730B2 (en) | 2013-03-15 | 2019-07-23 | Donaldson Company, Inc. | Filter media and elements |
US10543441B2 (en) | 2016-12-15 | 2020-01-28 | Hollingsworth & Vose Company | Filter media including adhesives and/or oleophobic properties |
US10653986B2 (en) | 2010-12-17 | 2020-05-19 | Hollingsworth & Vose Company | Fine fiber filter media and processes |
US10814261B2 (en) | 2017-02-21 | 2020-10-27 | Hollingsworth & Vose Company | Electret-containing filter media |
US10898838B2 (en) | 2016-12-15 | 2021-01-26 | Hollingsworth & Vose Company | Filter media including adhesives |
US11014030B2 (en) | 2016-02-17 | 2021-05-25 | Hollingsworth & Vose Company | Filter media including flame retardant fibers |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090326128A1 (en) * | 2007-05-08 | 2009-12-31 | Javier Macossay-Torres | Fibers and methods relating thereto |
CA2718897A1 (en) * | 2008-03-17 | 2009-09-17 | The Board Of Regents Of The University Of Texas System | Superfine fiber creating spinneret and uses thereof |
US8083828B2 (en) | 2009-06-19 | 2011-12-27 | Hollingsworth & Vose Company | Fiber web having a high stiffness |
FR2967341B1 (en) * | 2010-11-16 | 2021-05-21 | Spineguard | SYSTEM FOR DETERMINING THE QUALITY OF A BONE STRUCTURE OF A SUBJECT AND SYSTEM FOR CONSOLIDATION OF A BONE STRUCTURE OF A SUBJECT INCLUDING SUCH A DETERMINATION SYSTEM |
US8658067B2 (en) | 2011-02-07 | 2014-02-25 | Fiberio Technology Corporation | Apparatuses and methods for the deposition of microfibers and nanofibers on a substrate |
CA3074944A1 (en) | 2017-09-08 | 2019-03-14 | Board Of Regents Of The University Of Texas System | Mechanoluminescence polymer doped fabrics and methods of making |
US11427937B2 (en) | 2019-02-20 | 2022-08-30 | The Board Of Regents Of The University Of Texas System | Handheld/portable apparatus for the production of microfibers, submicron fibers and nanofibers |
Citations (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2786759A (en) * | 1954-12-10 | 1957-03-26 | Armstrong Cork Co | Method of making felted, fibrous sheet material |
US3036950A (en) * | 1959-06-22 | 1962-05-29 | Burgess Cellulose Company | Process for incorporating resins into paper |
US3057772A (en) * | 1957-04-23 | 1962-10-09 | Riegel Paper Corp | Synthetic fiber paper and method of making same |
US4427722A (en) * | 1982-06-30 | 1984-01-24 | Sandy Hill Corporation | Apparatus for applying a controlled layer of a saturant or a coating via a free-falling vertical curtain |
US5038775A (en) * | 1988-01-04 | 1991-08-13 | Her Majesty The Queen In Right Of Canada As Represented By The Minister Of National Defence Of Canadian Government | Plastic scrim |
US5167764A (en) * | 1990-07-02 | 1992-12-01 | Hoechst Celanese Corporation | Wet laid bonded fibrous web |
US5397632A (en) * | 1993-05-14 | 1995-03-14 | Reemay, Inc. | Nonwoven laminated composite article capable or readily undergoing pleating to form a stable pleated depth gaseous filtration medium |
US5419953A (en) * | 1993-05-20 | 1995-05-30 | Chapman; Rick L. | Multilayer composite air filtration media |
US5630856A (en) * | 1994-03-14 | 1997-05-20 | Upf Corporation | Self-supporting filter composite |
US5800585A (en) * | 1997-04-03 | 1998-09-01 | Choi; Kyung-Ju | Self-supporting pocket fluid filter |
US5900305A (en) * | 1997-01-24 | 1999-05-04 | Chapman; Rick L. | Laminated high efficiency filter |
US5993501A (en) * | 1996-11-08 | 1999-11-30 | Johns Manville International, Inc. | Composite filter media |
US6159318A (en) * | 1998-10-21 | 2000-12-12 | Aaf International, Inc. | Method for forming fibrous filter media, filter units and product |
US6254653B1 (en) * | 1999-10-08 | 2001-07-03 | Aaf International | Pleated fluid filter medium blend |
US20010013346A1 (en) * | 1998-11-05 | 2001-08-16 | Joel F. Lemke | Underwater breathing apparatus and method |
US6521321B2 (en) * | 1995-11-17 | 2003-02-18 | Donaldson Company, Inc. | Filter material construction and method |
US6579350B2 (en) * | 2000-11-14 | 2003-06-17 | Lydall, Inc. | Air laid/wet laid gas filtration media |
US6670035B2 (en) * | 2002-04-05 | 2003-12-30 | Arteva North America S.A.R.L. | Binder fiber and nonwoven web |
US6695148B2 (en) * | 1999-05-27 | 2004-02-24 | Edward C. Homonoff | Transmission filter felt |
US20040255783A1 (en) * | 2003-06-19 | 2004-12-23 | Graham Kristine M. | Cleanable high efficiency filter media structure and applications for use |
US6858057B2 (en) * | 1999-10-29 | 2005-02-22 | Hollingsworth & Vosa Company | Filter media |
US20060137318A1 (en) * | 2004-12-28 | 2006-06-29 | Lim Hyun S | Filtration media for filtering particulate material from gas streams |
US20060191655A1 (en) * | 2005-01-28 | 2006-08-31 | Nunn Kayren J | Composite web and process for manufacture from post-industrial scrap |
US7407701B2 (en) * | 2004-07-30 | 2008-08-05 | Kx Technologies Llc | Lofted composite with enhanced air permeability |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050148266A1 (en) * | 2003-12-30 | 2005-07-07 | Myers David L. | Self-supporting pleated electret filter media |
-
2005
- 2005-11-29 US US11/288,860 patent/US20060292947A1/en not_active Abandoned
-
2006
- 2006-06-20 CA CA2550466A patent/CA2550466C/en active Active
- 2006-06-23 MX MXPA06007263A patent/MXPA06007263A/en unknown
- 2006-09-29 US US11/541,329 patent/US20070023958A1/en not_active Abandoned
Patent Citations (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2786759A (en) * | 1954-12-10 | 1957-03-26 | Armstrong Cork Co | Method of making felted, fibrous sheet material |
US3057772A (en) * | 1957-04-23 | 1962-10-09 | Riegel Paper Corp | Synthetic fiber paper and method of making same |
US3036950A (en) * | 1959-06-22 | 1962-05-29 | Burgess Cellulose Company | Process for incorporating resins into paper |
US4427722A (en) * | 1982-06-30 | 1984-01-24 | Sandy Hill Corporation | Apparatus for applying a controlled layer of a saturant or a coating via a free-falling vertical curtain |
US5038775A (en) * | 1988-01-04 | 1991-08-13 | Her Majesty The Queen In Right Of Canada As Represented By The Minister Of National Defence Of Canadian Government | Plastic scrim |
US5167764A (en) * | 1990-07-02 | 1992-12-01 | Hoechst Celanese Corporation | Wet laid bonded fibrous web |
US5397632A (en) * | 1993-05-14 | 1995-03-14 | Reemay, Inc. | Nonwoven laminated composite article capable or readily undergoing pleating to form a stable pleated depth gaseous filtration medium |
US5419953A (en) * | 1993-05-20 | 1995-05-30 | Chapman; Rick L. | Multilayer composite air filtration media |
US5630856A (en) * | 1994-03-14 | 1997-05-20 | Upf Corporation | Self-supporting filter composite |
US6521321B2 (en) * | 1995-11-17 | 2003-02-18 | Donaldson Company, Inc. | Filter material construction and method |
US6872431B2 (en) * | 1995-11-17 | 2005-03-29 | Donaldson Company, Inc. | Filter material construction and method |
US5993501A (en) * | 1996-11-08 | 1999-11-30 | Johns Manville International, Inc. | Composite filter media |
US5900305A (en) * | 1997-01-24 | 1999-05-04 | Chapman; Rick L. | Laminated high efficiency filter |
US5800585A (en) * | 1997-04-03 | 1998-09-01 | Choi; Kyung-Ju | Self-supporting pocket fluid filter |
US6159318A (en) * | 1998-10-21 | 2000-12-12 | Aaf International, Inc. | Method for forming fibrous filter media, filter units and product |
US20010013346A1 (en) * | 1998-11-05 | 2001-08-16 | Joel F. Lemke | Underwater breathing apparatus and method |
US6695148B2 (en) * | 1999-05-27 | 2004-02-24 | Edward C. Homonoff | Transmission filter felt |
US6254653B1 (en) * | 1999-10-08 | 2001-07-03 | Aaf International | Pleated fluid filter medium blend |
US6858057B2 (en) * | 1999-10-29 | 2005-02-22 | Hollingsworth & Vosa Company | Filter media |
US6579350B2 (en) * | 2000-11-14 | 2003-06-17 | Lydall, Inc. | Air laid/wet laid gas filtration media |
US6670035B2 (en) * | 2002-04-05 | 2003-12-30 | Arteva North America S.A.R.L. | Binder fiber and nonwoven web |
US20040255783A1 (en) * | 2003-06-19 | 2004-12-23 | Graham Kristine M. | Cleanable high efficiency filter media structure and applications for use |
US7407701B2 (en) * | 2004-07-30 | 2008-08-05 | Kx Technologies Llc | Lofted composite with enhanced air permeability |
US20060137318A1 (en) * | 2004-12-28 | 2006-06-29 | Lim Hyun S | Filtration media for filtering particulate material from gas streams |
US20060191655A1 (en) * | 2005-01-28 | 2006-08-31 | Nunn Kayren J | Composite web and process for manufacture from post-industrial scrap |
Cited By (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8986432B2 (en) | 2007-11-09 | 2015-03-24 | Hollingsworth & Vose Company | Meltblown filter medium, related applications and uses |
US8608817B2 (en) | 2007-11-09 | 2013-12-17 | Hollingsworth & Vose Company | Meltblown filter medium |
US8419934B1 (en) * | 2008-10-30 | 2013-04-16 | Sundance Spas, Inc. | Filter |
US9950284B2 (en) | 2009-04-03 | 2018-04-24 | Hollingsworth & Vose Company | Filter media suitable for hydraulic applications |
US8950587B2 (en) | 2009-04-03 | 2015-02-10 | Hollingsworth & Vose Company | Filter media suitable for hydraulic applications |
US10682595B2 (en) | 2009-04-03 | 2020-06-16 | Hollingsworth & Vose Company | Filter media suitable for hydraulic applications |
US9283501B2 (en) | 2010-04-27 | 2016-03-15 | Hollingsworth & Vose Company | Filter media with a multi-layer structure |
US8679218B2 (en) | 2010-04-27 | 2014-03-25 | Hollingsworth & Vose Company | Filter media with a multi-layer structure |
US10155187B2 (en) | 2010-04-27 | 2018-12-18 | Hollingsworth & Vose Company | Filter media with a multi-layer structure |
US11458427B2 (en) | 2010-12-17 | 2022-10-04 | Hollingsworth & Vose Company | Fine fiber filter media and processes |
US10874962B2 (en) | 2010-12-17 | 2020-12-29 | Hollingsworth & Vose Company | Fine fiber filter media and processes |
US10155186B2 (en) | 2010-12-17 | 2018-12-18 | Hollingsworth & Vose Company | Fine fiber filter media and processes |
US10653986B2 (en) | 2010-12-17 | 2020-05-19 | Hollingsworth & Vose Company | Fine fiber filter media and processes |
US11253802B2 (en) | 2013-03-15 | 2022-02-22 | Donaldson Company, Inc. | Filter media and elements |
US10357730B2 (en) | 2013-03-15 | 2019-07-23 | Donaldson Company, Inc. | Filter media and elements |
US9694306B2 (en) | 2013-05-24 | 2017-07-04 | Hollingsworth & Vose Company | Filter media including polymer compositions and blends |
US9474994B2 (en) | 2013-06-17 | 2016-10-25 | Donaldson Company, Inc. | Filter media and elements |
US20160082376A1 (en) * | 2014-09-19 | 2016-03-24 | Kyung-Ju Choi | Filter material comprising an expanded polytetrafluoroethylene containing layer and a natural fiber containing layer |
US10272375B2 (en) * | 2014-09-19 | 2019-04-30 | Clean And Science Company, Ltd. | Filter material comprising an expanded polytetrafluoroethylene containing layer and a natural fiber containing layer |
US11684885B2 (en) | 2014-12-19 | 2023-06-27 | Hollingsworth & Vose Company | Filter media comprising a pre-filter layer |
US10343095B2 (en) | 2014-12-19 | 2019-07-09 | Hollingsworth & Vose Company | Filter media comprising a pre-filter layer |
US11167232B2 (en) | 2014-12-19 | 2021-11-09 | Hollingsworth & Vose Company | Filter media comprising a pre-filter layer |
US10252200B2 (en) | 2016-02-17 | 2019-04-09 | Hollingsworth & Vose Company | Filter media including a filtration layer comprising synthetic fibers |
US11014030B2 (en) | 2016-02-17 | 2021-05-25 | Hollingsworth & Vose Company | Filter media including flame retardant fibers |
US11738295B2 (en) | 2016-02-17 | 2023-08-29 | Hollingsworth & Vose Company | Filter media including flame retardant fibers |
US11123668B2 (en) | 2016-02-17 | 2021-09-21 | Hollingsworth & Vose Company | Filter media including a filtration layer comprising synthetic fibers |
US10898838B2 (en) | 2016-12-15 | 2021-01-26 | Hollingsworth & Vose Company | Filter media including adhesives |
US11819790B2 (en) | 2016-12-15 | 2023-11-21 | Hollingsworth & Vose Company | Filter media including adhesives and/or oleophobic properties |
US11484821B2 (en) | 2016-12-15 | 2022-11-01 | Hollingsworth & Vose Company | Filter media including adhesives |
US11369904B2 (en) | 2016-12-15 | 2022-06-28 | Hollingsworth & Vose Company | Filter media including adhesives and/or oleophobic properties |
US10543441B2 (en) | 2016-12-15 | 2020-01-28 | Hollingsworth & Vose Company | Filter media including adhesives and/or oleophobic properties |
US10814261B2 (en) | 2017-02-21 | 2020-10-27 | Hollingsworth & Vose Company | Electret-containing filter media |
US11077394B2 (en) * | 2017-02-21 | 2021-08-03 | Hollingsworth & Vose Company | Electret-containing filter media |
US20210178304A1 (en) * | 2017-02-21 | 2021-06-17 | Hollingsworth & Vose Company | Electret-containing filter media |
US20180236384A1 (en) * | 2017-02-21 | 2018-08-23 | Hollingsworth & Vose Company | Electret-containing filter media |
Also Published As
Publication number | Publication date |
---|---|
CA2550466A1 (en) | 2006-12-24 |
CA2550466C (en) | 2012-11-20 |
US20070023958A1 (en) | 2007-02-01 |
MXPA06007263A (en) | 2007-01-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA2550466C (en) | Polyester fiber scrim and method for making same | |
US8083828B2 (en) | Fiber web having a high stiffness | |
US8282712B2 (en) | Air filtration medium with improved dust loading capacity and improved resistance to high humidity environment | |
DE102007027299B4 (en) | Filter, process for its production, its use and filter modules | |
EP2018346B1 (en) | Nonwoven, tufted nonwoven and products containing the fabrics | |
US20070220852A1 (en) | High Capacity Filter Medium | |
US20020083837A1 (en) | Air laid/wet laid gas filtration media | |
KR100452179B1 (en) | High precision cylinder filter | |
US20210178304A1 (en) | Electret-containing filter media | |
JP2008142697A (en) | Filter medium, device, and method for high-temperature filtration | |
US20220054961A1 (en) | Electret-containing filter media | |
JP2009209456A (en) | Filter nonwoven fabric | |
US7153793B2 (en) | Multilayer nonwovens incorporating differential cross-sections | |
DE10332439B3 (en) | Two-layer synthetic filter element | |
DE102009006583A1 (en) | Multi-layer filter material for liquid filtration, for manufacturing filter element, has three layers, where former layer is of wet fleece made of cellulose or synthetic fibers or mixture | |
US20160082376A1 (en) | Filter material comprising an expanded polytetrafluoroethylene containing layer and a natural fiber containing layer | |
JPH08120552A (en) | Conjugated fiber nonwoven fabric | |
JP5159529B2 (en) | Air filter media | |
KR102426658B1 (en) | Filter media with excellent heat resistance | |
JP2018199253A (en) | Laminate sound absorber containing ultra-fine fiber | |
WO2018225671A1 (en) | Long-fiber nonwoven fabric and filter reinforcement material using same | |
KR101012401B1 (en) | Air filter comprising a staple fiber non-woven support with high an air-permeability and Method of preparing the same | |
JP2019001012A (en) | Laminate sound absorber containing ultra-fine fiber | |
JPH0788312A (en) | Filter medium and its production | |
CN111809307A (en) | Filter media and method of making same |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ELK PREMIUM PRODUCTS, INC., TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LAVIETES, DANIEL;HEINE, DARRELL;BUSH, KEVIN J.;REEL/FRAME:017558/0608;SIGNING DATES FROM 20060131 TO 20060206 |
|
AS | Assignment |
Owner name: ELK PREMIUM BUILDING PRODUCTS, INC, TEXAS Free format text: CORRECTIVE ASSIGNMENT TO CORRECT THE ASSIGNEE'S NAME PREVIOUSLY RECORDED ON REEL 017558, FRAME 0608;ASSIGNORS:LAVIETES, DANIEL;HEINE, DARRELL;BUSH, KEVIN J.;REEL/FRAME:018094/0447;SIGNING DATES FROM 20060131 TO 20060206 |
|
AS | Assignment |
Owner name: DEUTSCHE BANK TRUST COMPANY AMERICAS,NEW YORK Free format text: SECURITY AGREEMENT;ASSIGNORS:ELKCORP;ELK PREMIUM BUILDING PRODUCTS, INC.;ELK CORPORATION OF AMERICA;AND OTHERS;REEL/FRAME:019466/0247 Effective date: 20070509 Owner name: DEUTSCHE BANK AG NEW YORK BRANCH,NEW YORK Free format text: SECURITY AGREEMENT;ASSIGNORS:ELKCORP;ELK PREMIUM BUILDING PRODUCTS, INC.;ELK CORPORATION OF AMERICA;AND OTHERS;REEL/FRAME:019466/0270 Effective date: 20070509 Owner name: DEUTSCHE BANK AG NEW YORK BRANCH, NEW YORK Free format text: SECURITY AGREEMENT;ASSIGNORS:ELKCORP;ELK PREMIUM BUILDING PRODUCTS, INC.;ELK CORPORATION OF AMERICA;AND OTHERS;REEL/FRAME:019466/0270 Effective date: 20070509 Owner name: DEUTSCHE BANK TRUST COMPANY AMERICAS, NEW YORK Free format text: SECURITY AGREEMENT;ASSIGNORS:ELKCORP;ELK PREMIUM BUILDING PRODUCTS, INC.;ELK CORPORATION OF AMERICA;AND OTHERS;REEL/FRAME:019466/0247 Effective date: 20070509 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |